BCN Ch 23 Flashcards
What are some purposes of the CBF?
Protection against sudden movements
Transportation for nutrients, wastes, elements of the immune system
What are the 5 parts of the lateral ventricles?
anterior (frontal) horn body (central) atrium (trigone) posterior horn (occipital) inferior (temporal) horn
What is special about the anterior horn?
there’s no choroid plexus so this makes it excellent for the placement of shunts
What is the most expanded part of the lateral ventricles?
Atrium
Where is the posterior horn located?
in the occipital lobe
also devoid of choroid plexus
What is the interventricular foramen?
passageway between third and lateral ventricles
What is the narrowist part of the ventricle system?
Cerebral Aqueduct (connection of 3rd and 4th ventricle) -Subject to blockages causing obstructive hydrocephalis
Where is the majority of CSF secreted?
lateral, third and fourth ventricles
How much CSF is in the choroid plexus?
150 mL
- 75 mL in cisterns
- 50 mL in subarachnoid space
- 25 mLin ventricles
How fast is CSF formed?
.5 mL/min
- 450-600 mL/day
- CSF is turned over 3-4x/day
Where is CSF produced?
ventricles
Where is CSF commonly drawn?
Lumbar Puncture
-performed below L2 (no spinal cord to hit at that level)
What color is CSF supposed to be when tapped?
Clear
- Red means recent hemorrhage
- Turbid means infection
- Yellow means excessive protein (stagnation or blood breakdown)
What are the forms of hydrocephalus?
Obstructive - blockage of CSF flow within ventricular system
Communicating - disruption of CSF outside of ventricular system (result of hemorrhage or infection)
What is normal intracranial pressure?
